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CAPTCHA formation in OpenCV

A CAPTCHA (an acronym for "Completely Automated Public Turing test to tell Computers and Humans Apart") is a type of challenge-response test used in computing to determine whether or not the user is human. It protects your website from spam by means of math logic, easily
understood by human beings. You will not have to spend your precious
time on annoying attempts to understand hard-to-read words, combinations
of letters or pictures that make your eyes pop up.